The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))

Question

Hello all,

I am trying to extract a MSG files from a PST. While extracting, I randomly get the following error:

The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))

Any suggestions how to remove this error. I can post the code in case that helps.

Answer 1

Which call returns that error?

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Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption Redemption - what the Outlook Object Model should have been Version 5.5 is now available!

Answer 2

Hi Dmitry,

below is the sample code for the application. Usually i get this error randomly Application, Namespace or other Com objects. However, most of the times I get it right at Application.

private static void fnExtractMSGFiles(string strPSTFileName, string pstFilePath)
        {
            Application app = new Application();
            NameSpace outlookNs = null;
            MAPIFolder rootFolder = null;
            Folders subFolders = null;
            Items items = null;


            try
            {
                outlookNs = app.GetNamespace("MAPI");

                // Add PST file (Outlook Data File) to Default Profile
                outlookNs.AddStore(pstFilePath);
                rootFolder = outlookNs.Stores[2].GetRootFolder();
                string strStoreName = outlookNs.Stores[2].DisplayName.ToString();

                // Traverse through all folders in the PST file
                subFolders = rootFolder.Folders;

                foreach (Folder folder in subFolders)
                {
                    string stringFolderPath = strExtractedFolderPath + strPSTFileName + @"\" + strStoreName + @"\" + folder.Name.ToString();
                    items = folder.Items;

                    foreach (object item in items)
                    {
                        if (item is MailItem)
                        {
                            if (!Directory.Exists(stringFolderPath))
                                Directory.CreateDirectory(stringFolderPath);

                            // Retrieve the Object into MailItem
                            MailItem mailItem = item as MailItem;

                           
                            if (mailItem.Subject != null)
                            {
                                // Save the message to disk in MSG format without invalid characters [\ / : * ? " < > |]
                                string filePath = stringFolderPath + @"\" + Regex.Replace(mailItem.Subject, @"[^\w\.@-]", "", RegexOptions.None, TimeSpan.FromSeconds(1.5));
                                if (filePath.Length > 150)
                                    filePath = filePath.Substring(0, 150) + ".msg";

                                else
                                    filePath = filePath + ".msg";

                                if (File.Exists(filePath))
                                { 
                                 // If duplicate file exists then create a copy of it
                                }
                                else
                                    mailItem.SaveAs(filePath, OlSaveAsType.olMSG);

                                Console.WriteLine("Folder :- " + folder.Name + "--------" + "MailItem Name :- " + mailItem.Subject);

                            }

                            if (mailItem != null)
                                Marshal.FinalReleaseComObject(mailItem);

                            
                        }
                    }
                }

                Thread.Sleep(1000);

                // Remove PST file from Default Profile
                outlookNs.RemoveStore(rootFolder);                

                // Copy PST files to backup folder
                fnCopyExtractedPSTFiles(pstFilePath, strPSTFileName);
                

            }

            catch (System.Exception ex)
            {
                //Log exception here

                // Remove PST file from Default Profile
                outlookNs.RemoveStore(rootFolder);
            }

            finally 
            {
                //Release com objects
                if (items != null)
                    Marshal.ReleaseComObject(items);

                if (subFolders != null)
                    Marshal.ReleaseComObject(subFolders);

                if (rootFolder != null)
                    Marshal.ReleaseComObject(rootFolder);

                if (outlookNs != null)
                    Marshal.ReleaseComObject(outlookNs);

                if (app != null)
                    Marshal.ReleaseComObject(app);

                Thread.Sleep(1000);

            }

        }

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ashishshukla.1183

Answer 3

Do you mean you would get that error when calling "new Application"?

It means what it says - the app you are calling (Outlook) is busy and the COM system timed out waiting for it. You need to retry later.

---

Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption Redemption - what the Outlook Object Model should have been Version 5.5 is now available!

Answer 4

Hi Dmitry,

You are right. Thats when I get mostly the error.

I understand the application is busy to retrieve any data, but what should be done to avoid such error.

In my case, I donot have outlook (infact any office application) opened in the background. So I guess, my code only is instantiating outlook process. So not sure how to handle such scenarios.

I have even induced a sleep time of 3000, but that even didn't helped.

---

ashishshukla.1183

Answer 5

Try something like the following:

uint errorCode = 0;
do
{
  try
  {
    Application app = new Application();
  }
  catch(COMException ce)
  {
    errorCode = (uint)ce.ErrorCode; 
  }
} while (erroCode == 0x8001010A);

---

Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption Redemption - what the Outlook Object Model should have been Version 5.5 is now available!

Answer 6

Hi Dmitry,

I induced sleep time just after new application and it works fine so far. I guess that object is was causing the trouble.

---

ashishshukla.1183